[SAT6] Multiple content-views including same repository with different RPM-filters aren't combinable in composite content-views

Issue

• A composite content-view composed by multiple content-views containing the same repository with different RPM filters does not result in a combined RPM-collection.
  • CV 'cv-A' with a filter for 'packageA'
  • CV 'cv-B' with a filter on the same repository for 'packageB'
  • CCV 'ccv-A' containing 'cv-A' and 'cv-B' shows 2 packages, but a attached host is only able to get access to 'packageA'